Gera in Fausset's Bible Dictionary

Son, i.e. descendant, of Benjamin; enumerated in the list when Jacob went into Egypt (Genesis 46:21); son of Bela (1 Chronicles 8:3, where probably but one Gera is genuine); in the loins of his grandfather Benjamin then, but not actually born until after the going to Egypt and before Jacob's death. Numbers 26 omits Gera as not being head of a family hut being one of the Belaites; his mention in Genesis implies that ultimately he became head of a family. Gera, Ehud's ancestor, and Gera, Shimei's ancestor, is the same person (Judges 3:15; 2 Samuel 16:5).